The best developer experience
for load testing

Open source load testing tool and SaaS
for engineering teams


How It Works

Same script for local and cloud tests

Built for engineering teams


  • The k6 API and CLI are easy-to-use, flexible and powerful.

  • Write tests in Javascript that mimic real-world scenarios.

DevOps & SREs

  • Automate your tests to ensure that your infrastructure and application remain performant.

  • Configure SLOs in your k6 script to test the health of your services.

Software Testers & QAs

  • Create tests faster with our test builder, recorder or converters (JMeter, Postman, Swagger).

  • Extensive documentation, awesome community and first class support.

Powerful Scripting

No XML. No DSL. Just familiar scripting with ES6 JS

1import http from 'k6/http';
2import {check, sleep} from 'k6';
4export default function() {
5 const data = {username: 'username', password: 'password'};
6 let res ='', data);
7 check(res, { 'success login': (r) => r.status === 200 });
8 sleep(0.3);


Leverage k6 in your workflow with the tools your team uses every day

Still stuck with JMeter?

"The engineering effort of writing tests for just one of our microservices was going to be 2+ Engineering weeks in JMeter, versus the ½ day it took us in k6!"

Alex Hibbitt, Site Reliability Engineer.

k6 included in tech radar

What our users are saying

So @k6_io is probably my new favourite tool. Super quick to get set up and running load tests 😻

I'm 90% complet on my #PoC and in my professional opinion @k6_io is definitely a #gamechanger for #performance #testing allows #shiftleft excellent #docs support 4 #Docker #javascript custom #metrics and establish #thresholds to pass/fail #cicd builds for both #webui & #API

Toying around with @k6_io tonight. Pretty impressed with how easy it is to set up (yay @Docker!) and to start building test scripts. Some early results:

@k6_io I love you ❤️ this is the second time you helped us track down a nasty bug in @grafana that only happens under heavy load. Thank you for a great tool! Btw I've heard our offices are close by, we should definitely meet up sometime...

personally using @k6_io and its has helped us quite a lot already. Definitely worth adding to your testing pipeline.

Lately I have been using @k6_io for performance testing the RESTful APIs we build and I simply fell in love with it. It so simple and easy to use, i highly recommend it!!

Loving @k6_io for integrating perf tests into @AzureDevOps pipelines. Great documentation, easy to use..

I've been tinkering with load testing recently and discovered @loadimpact. I'm absolutely loving it! I got up and running in minutes. Its UI is intuitive, and being based on JS makes it a breeze to start writing tests. That's not even mentioning the amazing open source k6! 😍

Why people love k6?